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View Resource National Institute of Standards and Technology: Time and Frequency Division

"The Time and Frequency Division, part of NIST's Physics Laboratory, maintains the standard for frequency and time interval for the United States, provides official time to the United States, and carries out a broad program of research and service activities in time and frequency metrology." At this website, visitors can find online exhibits about ethnic and historical calendars, the history of...

https://www.nist.gov/pml/time-and-frequency-division
View Resource Library of Congress: How does an hourglass measure time?

Everyday Mysteries: Fun Facts from the Library of Congress offers an explanation for how an hourglass measures time. Learn about the careful calibration of this age-old timepiece and what factors affect the accuracy of the sand clock. The website provides links to related websites that provide a brief history of the hourglass and sell custom hourglasses. The U.S Official Time website, which is...

http://www.loc.gov/rr/scitech/mysteries/hourglass.html
View Resource BBC News: A brief history of time zones

How do time zones work? Perhaps equally important is why do we even have time zones? The BBC News group has created this interactive and fun exploration of time zones for the general public. After a brief introduction, visitors can continue on to a globe complete with tabs that read, "Where time collides", "Split time", "The politics of time", and "What time is it in space?" Clicking on each of...

http://www.bbc.co.uk/news/world-12849630
View Resource British Museum: Explore: Time

What is time? What does it mean to us? These are a but a few of the arresting questions asked by the British Museum's online exhibit exploring the nature, structure, and history of time, time-keeping, and other related subjects. This particular section is part of their larger "Explore" online collection, and it draws on the British Museum's vast holdings to look into this scientific, cultural, and...

http://www.britishmuseum.org/explore/themes/time/introductio...